Just for someting different? What are your motives/reasoning for wanting rockwells on a 1028? M1028's aleady have the sought after and proven D60 w/limited slip and 14bolt w/ locker combo.
If you plan on doing a bunch of modifications to make a serious offroader, rockwells are perfect. But if you want a truck that you can go camping, take to the mall, hook up to your boat, and do some moderate offroading. A 4 inch lift and some 35-37" tires will do just fine.